From 9e20cbd7294ef76d2b7270b56af59fb82fea5785 Mon Sep 17 00:00:00 2001
From: Tom Ryder <tom@sanctum.geek.nz>
Date: Sun, 5 Nov 2017 01:16:46 +1300
Subject: Block 'formatoptions' 'a' flag on old Vim versions

If I ever care, this needs more careful testing to find the version in
which the flag was added.
---
 vim/config/format.vim | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

(limited to 'vim')

diff --git a/vim/config/format.vim b/vim/config/format.vim
index 688b60c9..40019d0a 100644
--- a/vim/config/format.vim
+++ b/vim/config/format.vim
@@ -9,22 +9,36 @@ endif
 " Use toggle_option_flag.vim plugin to bind quick toggle actions for some
 " 'formatoptions' flags:
 "
+" c - Automatically wrap comments at 'textwidth' (which I allow the filetypes
+"     to set for me)
+" t - Automatically wrap text at 'textwidth' (as above)
+"
+" Only in Vim >= 7.1 (I think):
+"
 " a - Automatically format paragraphs, reapplying the wrap on every text
 "     insertion or deletion; sometimes I want this and sometimes I
 "     don't, it particularly varies when typing prose in Markdown that
 "     includes headings and code
-" c - Automatically wrap comments at 'textwidth' (which I allow the filetypes
-"     to set for me)
-" t - Automatically wrap text at 'textwidth' (as above)
 "
 if has('eval') && has('user_commands')
-  nnoremap <silent>
-        \ <Leader>a
-        \ :<C-U>ToggleOptionFlagLocal formatoptions a<CR>
+
+  " 'c' and 't' have both been around since at least 6.1
   nnoremap <silent>
         \ <Leader>c
         \ :<C-U>ToggleOptionFlagLocal formatoptions c<CR>
   nnoremap <silent>
         \ <Leader>t
         \ :<C-U>ToggleOptionFlagLocal formatoptions t<CR>
+
+  " 'a' is newer
+  if v:version >= 701
+    nnoremap <silent>
+          \ <Leader>a
+          \ :<C-U>ToggleOptionFlagLocal formatoptions a<CR>
+  else
+    nnoremap <silent>
+          \ <Leader>a
+          \ :<C-U>echomsg 'No "formatoptions" "a" flag in Vim < 7.1'<CR>
+  endif
+
 endif
-- 
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